Attorney General Jeff Sessions on Monday warned so-called sanctuary cities they could lose federal money for refusing to cooperate with immigration authorities and suggested the government would come after grants that have already been awarded if they don't comply.

Sessions said the Justice Department would require cities seeking some of .1 billion available in grant money to verify that they are in compliance with a section of federal law that allows information sharing with immigration officials. (Reuters)

Attorney General Jeff Sessions on Monday warned so-called sanctuary cities they could lose federal money for refusing to cooperate with immigration authorities and suggested the government would come after grants that have already been awarded if they don’t comply.

Sessions said the Justice Department would require cities seeking some of $4.1 billion available in grant money to verify that they are in compliance with a section of federal law that allows information sharing with immigration officials.

His statements in the White House briefing room brought to mind tough talk from President Donald Trump’s campaign and came just three days after the administration’s crushing health care defeat. But Sessions also acknowledged he was reiterating a similar policy adopted by the Obama administration last year.

“I urge the nation’s states and cities to carefully consider the harm they are doing to their citizens by refusing to enforce our immigration laws,” Sessions said.

The message is a furtherance of Trump’s campaign promise to “defund” sanctuary cities by taking away their federal funding. But legal precedent suggests that would be difficult.

The Obama administration issued the same warning last year, telling cities they risked losing grant money in 2017 if they didn’t comply with the law.

Sessions did detail what specific factors would trigger the government to deny or strip a city of money, only that it would take “all lawful steps to claw-back” funds to cities deemed to be out of compliance.

The White House last week stepped up pressure on sanctuary cities by releasing a report on local jails that listed more than 200 cases of immigrants released from custody before federal agents could intervene. That list was compiled following an executive order Trump signed in January that called on the government to document which local jurisdictions aren’t cooperating with federal efforts to find and deport immigrants in the country illegally.

Refusing to honor such immigration detainer requests would not put a city in violation of the statute Sessions cited, which deals instead with law enforcement sharing of information about someone’s immigration status.

Meanwhile, municipal leaders nationwide vowed to defy any crackdown.

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“We are going to become this administration’s worst nightmare,” said New York City Council Speaker Melissa Mark-Viverito, who was among officials gathered in New York for a small conference that attracted officials from cities including San Francisco, Seattle, Denver, Chicago, Philadelphia and New York.

Mark-Viverito and others promised to block federal immigration agents from accessing certain private areas on city property, to restrict their access to schools and school records and to offer legal services to immigrants in the country illegally.

California Senate leader Kevin de León called Sessions’ message, “nothing short of blackmail. … Their gun-to-the-head method to force resistant cities and counties to participate in Trump’s inhumane and counterproductive mass-deportation is unconstitutional and will fail.”